package com.zrx.zrxpicturebackend.service.impl;

import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.util.ObjUtil;
import cn.hutool.core.util.StrUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zrx.zrxpicturebackend.constant.UserConstant;
import com.zrx.zrxpicturebackend.exception.BusinessException;
import com.zrx.zrxpicturebackend.exception.ErrorCode;
import com.zrx.zrxpicturebackend.model.dto.user.UserQueryRequest;
import com.zrx.zrxpicturebackend.model.entity.User;
import com.zrx.zrxpicturebackend.model.enums.UserRoleEnum;
import com.zrx.zrxpicturebackend.model.vo.LoginUserVO;
import com.zrx.zrxpicturebackend.model.vo.UserVO;
import com.zrx.zrxpicturebackend.service.SpaceService;
import com.zrx.zrxpicturebackend.service.UserService;
import com.zrx.zrxpicturebackend.mapper.UserMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
* @author zrx
* @description 针对表【user(用户)】的数据库操作Service实现
* @createDate 2025-01-16 21:30:38
*/
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User>
    implements UserService{

    @Resource
    @Lazy
    private SpaceService spaceService;

    /**
     * 用户注册
     * @param userAccount 用户账号
     * @param userPassword 用户密码
     * @param checkPassword 确认密码
     * @return 用户id
     */
    @Override
    public long userRegister(String userAccount, String userPassword, String checkPassword) {
        // 校验
        if (StrUtil.hasBlank(userAccount, userPassword, checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if (userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短");
        }
        if (userPassword.length() < 8 || checkPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短");
        }
        if (!userPassword.equals(checkPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"两次密码不一致");
        }
        // 校验账户是否重复
        Long count = this.baseMapper.selectCount(Wrappers.lambdaQuery(User.class)
                .eq(User::getUserAccount, userAccount));
        if (count > 0){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"账号重复");
        }
        //加密
        String encryptPassword = encryptPassword(userPassword);
        //插入数据
        User user = new User();
        user.setUserAccount(userAccount);
        user.setUserPassword(encryptPassword);
        user.setUserName("无名");
        user.setUserRole(UserRoleEnum.USER.getValue());
        boolean save = this.save(user);
        if (!save){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"注册失败");
        }
        spaceService.addSpace(null, user);
        return user.getId();
    }

    /**
     * 用户登录
     *
     * @param userAccount  用户账户
     * @param userPassword 用户密码
     * @return 脱敏后的用户信息
     */
    @Override
    public LoginUserVO userLogin(String userAccount, String userPassword, HttpServletRequest request){
        //校验
        if (StrUtil.hasBlank(userAccount, userPassword)){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"参数为空");
        }
        if (userAccount.length() < 4){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户账号过短");
        }
        if (userPassword.length() < 8){
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户密码过短");
        }

        //校验用户是否存在
        String encryptPassword = encryptPassword(userPassword);
        User user = this.baseMapper.selectOne(Wrappers.lambdaQuery(User.class)
                .eq(User::getUserAccount, userAccount)
                .eq(User::getUserPassword, encryptPassword));
        if (user == null){
            log.info(("用户不存在或者密码错误"));
            throw new BusinessException(ErrorCode.PARAMS_ERROR,"用户不存在或者密码错误");
        }

        //记录登录状态
        request.getSession().setAttribute(UserConstant.USER_LOGIN_STATE,user);

        return this.getLoginUserVO(user);


    }

    /**
     * 转换成脱密后的用户信息
     * @param user 用户信息
     * @return 脱密后的用户信息
     */
    @Override
    public LoginUserVO getLoginUserVO(User user) {
        if (user == null){
            return null;
        }
        LoginUserVO loginUserVO = new LoginUserVO();
        BeanUtils.copyProperties(user,loginUserVO);
        return loginUserVO;
    }


    /**
     * 加密
     * @param userPassword 用户密码
     * @return 加密后的密码
     */
    @Override
    public String encryptPassword(String userPassword) {
        //颜值 混淆密码
        final String SALT = "zrx";
        return DigestUtils.md5DigestAsHex((SALT + userPassword).getBytes());
    }

    /**
     * 获取当前登录用户
     * @param request
     * @return
     */
    @Override
    public User getLoginUser(HttpServletRequest request) {
        //先判断当前是否登录
        Object userObject = request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE);
        User currentUser = (User) userObject;
        if (currentUser == null || currentUser.getId() == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        //从数据库中查询（追求性能可以注释，直接返回上述结果）
        Long userId = currentUser.getId();
        User user = this.getById(userId);
        if (user == null){
            throw new BusinessException(ErrorCode.NOT_LOGIN_ERROR);
        }

        return user;
    }

    /**
     * 用户注销
     * @param request
     * @return
     */
    @Override
    public Boolean userLogout(HttpServletRequest request) {
        if (request.getSession().getAttribute(UserConstant.USER_LOGIN_STATE) == null){
            throw new BusinessException(ErrorCode.OPERATION_ERROR,"未登录");
        }
        request.getSession().removeAttribute(UserConstant.USER_LOGIN_STATE);
        return true;
    }


    @Override
    public UserVO getUserVO(User user) {
        if (user == null) {
            return null;
        }
        UserVO userVO = new UserVO();
        BeanUtils.copyProperties(user, userVO);
        return userVO;
    }

    @Override
    public List<UserVO> getUserVOList(List<User> userList) {
        if (CollUtil.isEmpty(userList)) {
            return new ArrayList<>();
        }
        return userList.stream().map(this::getUserVO).collect(Collectors.toList());
    }


    @Override
    public QueryWrapper<User> getQueryWrapper(UserQueryRequest userQueryRequest) {
        if (userQueryRequest == null) {
            throw new BusinessException(ErrorCode.PARAMS_ERROR, "请求参数为空");
        }
        Long id = userQueryRequest.getId();
        String userAccount = userQueryRequest.getUserAccount();
        String userName = userQueryRequest.getUserName();
        String userProfile = userQueryRequest.getUserProfile();
        String userRole = userQueryRequest.getUserRole();
        String sortField = userQueryRequest.getSortField();
        String sortOrder = userQueryRequest.getSortOrder();
        QueryWrapper<User> queryWrapper = new QueryWrapper<>();
        queryWrapper.eq(ObjUtil.isNotNull(id), "id", id);
        queryWrapper.eq(StrUtil.isNotBlank(userRole), "userRole", userRole);
        queryWrapper.like(StrUtil.isNotBlank(userAccount), "userAccount", userAccount);
        queryWrapper.like(StrUtil.isNotBlank(userName), "userName", userName);
        queryWrapper.like(StrUtil.isNotBlank(userProfile), "userProfile", userProfile);
        queryWrapper.orderBy(StrUtil.isNotEmpty(sortField), "ascend".equals(sortOrder), sortField);
        return queryWrapper;
    }

    @Override
    public boolean isAdmin(User user) {
        return user != null && UserRoleEnum.ADMIN.getValue().equals(user.getUserRole());
    }
}




